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Simultaneous study of subcellular exocytosis with individually addressable multiple microelectrodes.

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  • 1Department of Chemistry and Molecular Biology, University of Gothenburg, Sweden.

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Individually addressable microelectrode arrays (MEAs) enable the study of subcellular exocytosis heterogeneity in single cells. These microelectrode arrays successfully detect fast chemical events and variations within single cell exocytosis.

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Area of Science:

  • Electrochemistry
  • Cell Biology
  • Nanotechnology

Background:

  • Cell exocytosis is a fundamental process involving the release of cellular cargo.
  • Understanding exocytosis heterogeneity at the subcellular level is crucial for cell function studies.
  • Previous methods lacked the resolution to investigate exocytosis at the subcellular scale within single cells.

Purpose of the Study:

  • To apply individually addressable microelectrode arrays (MEAs) for studying subcellular exocytosis.
  • To investigate the heterogeneity of exocytosis at the subcellular level within single PC12 cells.
  • To assess the suitability of MEAs for detecting fast chemical events and developing electrochemical sensors.

Main Methods:

  • PC12 cells were cultured on microelectrode arrays (MEAs) with varying electrode densities and sizes (16, 25, 36 electrodes).
  • Single cells were selected after confirming they covered multiple subcellular-sized electrodes.
  • Amperometry was used to record exocytosis events at the subcellular level.

Main Results:

  • Single cell and subcellular exocytosis heterogeneity was electrochemically detected using the developed MEAs.
  • The MEAs demonstrated sensitivity to fast chemical events occurring at the single-cell level.
  • The results confirmed the capability of MEAs for investigating subcellular exocytosis.

Conclusions:

  • Individually addressable MEAs are effective tools for analyzing subcellular exocytosis heterogeneity.
  • These MEAs can detect fast chemical events and offer potential for multifunctional electrochemical sensing.
  • The study highlights the utility of MEAs in advancing the understanding of single-cell exocytosis dynamics.